Electric heater



R. J. PARSONS ELECTRIC HEATER Nov. 14, 1933.

Filed Jan. 18 1930 INVENTOR Roberf J Parsons BY by ATTORNEY Patented Nov. 14, 1933 UNITED STATES ELECTRIC HEATER Robert J. Parsons, Schenectady, N. Y., assigner to Consolidated Car-Heating Company,

Inc.,

, Albany, N. Y., a corporation of New York Application January 18, 1930. Serial No. 421,696

2 Claims.

For a detailed description of the present form of my invention, reference may be had to the following specification and to theA accompanying drawing forming a part thereof, wherein Fig. l is chiefly a vertical, longitudinal section of my device and Fig. 2 is anend view thereof.

My invention relates to the open-coil type of electric heater, wherein the heater coil is exposed on the outer surface of a core or spindle of porcelain, or other suitable insulating and fireproof material. My purpose is to improve the porcelain spindle by giving it a form that is materially lighter in weight than those heretofore employed, while still possessing the same practical qualities as a mounting for the electrical heating coil.

Referring to the drawing, A represents an approximately cylindrical tubular shell of porcelain forming a section of my spindle. Herein I show two such sections as joined end to end to compose the spindle. At each end there is applied to the outerend of the shell A a thick substantial porcelain disc B, provided on its outer face with a substantial lug D located at a point eccentric to the axis of the shell. On its inner face B has a projecting collar l) which fits into the end of hollow shell A. Between the two shell sections is an intermediate thick and substantial disc C having on each of its outer faces a collar c that also fits into the adjacent end of a hollow shell section A. The two end discs B, B are drawn tightly together and against the shell sections which they respectively abut by a steel rod K which also passes freely through the central disc C. On the outer face of each disc B is a steel plate E which is turned at its bottom edge to form a supporting foot for the heater. The said rod K also passes through the plates E and the nuts at each end of the rod bear against the upright faces of the plates. The plates E, E are also notched at one edge to permit the passage therethrough of the aforesaid eccentric projections or lugs D on the discs B. In the end of each lug D is a horizontal groove e and a hole also passes axially through the lug and through the body of the thick end-disc B. In the said groove e is seated one edge of a heavy metal plate F from which edge a rod f projects through the axial hole in lug D and receives a nut h by means of which the aforesaid plate F is drawn firmly into its seat in the groove e. On the top face of plate F is screwed the terminal plate G of the electric circuit, While the inner end of said rod f on the inside of disc B, but outside of shell A, is in a position adjacent to the end of the heater coil P, that is Wound on the outer surface of shell A, and may be readily connected thereto. On the outer surface of the shell-sections A are a series of guide studs Q which de- (Cl. 21S-19) fine the route followed by the heater coil P and maintain said coil in position on the shells without resort to the spiral groove heretofore employed for that purpose. By this means the shells A may be made thin and light with respect to their diameters, as compared with the thick blocks of which the spindle has heretofore been made. The interior diameter of shells A is much greater than the outside diameter of the steel rod K.

By the construction above described the mechanical strength of the spindle is provided chiefly by the thick block-like discs B, B and C together with the steel rod K, while the thin, ungrooved shells A, A merely bridge between the said discs to provide a cylindrical surface on which the heating coil lies and on which it is positioned by the upstanding studs Q, Q instead of a groove in the body of the porcelain cylinder. Said disks B, B also serve as the supporting means for the shell A.

What I claim as new and desire to secure by Letters Patent is:

1. A spindle for an electric heater comprising a tubular shell of dielectric material, end disks having reduced collars entering the bore of said shell at the ends thereof, said disks having eccentrically positioned lugs projected outwardly therefrom, the outer faces of said lugs having seats therein, means for maintaining said shell and said end disks in assembled relation, terminal members complemental to said seats, each terminal member having a supporting portion extended axially through the lug engaged thereby and another portion projected in the opposite direction from said lug, and terminal plates connected with the respective outwardly projected portions of the terminal members.

2. A spindle for an electric heater ccm-1w" a tubular shell of dielectric material, end disks having reduced collars entering the bore of said shell at the ends thereof, said disks having eccentrically positioned lugs projecting outwardly therefrom, the outer faces of said lugs having seats therein, a rod extended axially through the shell and said disks and provided with means for maintaining the shell and disks in assembled relation, plates bearing against the outer faces of said disks and provided with supporting feet, said plates having cut-out portions complemental to said lugs, terminal members complemental to said seats, each terminal member having a supporting portion extended axially through the lug engaged thereby, and another portion projected in the opposite direction from the lug, and terminal plates connected with the respective outwardly projected portions of the terminal members.

ROBERT J. PARSONS. 

